It is extremely useful for analyzing and testing filters and the stability of feedback control systems, through the. When invoked without lefthand arguments, nyquist produces a nyquist plot on the screen. Bode response of simulink model this example shows how to linearize a simulink model at the operating point specified in the model using the model linearizer. You can use this handle to customize the plot with the getoptions and setoptions commands. When w wmin,wmax, the bode plot is drawn for frequencies between wmin and wmax in radtimeunit, where timeunit. Setting the phase matching options so that at 1 rads the phase is near 750 degrees yields the second bode plot.
The bode plotter is an electronic instrument resembling an oscilloscope, which produces a bode diagram, or a graph, of a circuits voltage gain or phase shift plotted against frequency in a feedback control system or a filter. The first bode plot has a phase of 45 degrees at a frequency of 1 rads. Nyquist plots are used to analyze system properties including gain margin, phase margin, and stability. See match phase at specified frequency for an example of phase matching using the phasematchingfreq and phasematchingvalue options bodeplotsys,w draws the bode plot for frequencies specified by w. The watertank system block represents the plant in this control system and includes all of the system nonlinearities to specify the portion of the model to linearize, first open the linearization tab. The software adds the linearized model, linsys1, to the linear analysis workspace and generates a bode plot for the model. Bode plot of frequency response, or magnitude and phase.
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